HP RPN SCIENTIFIC WP 34S Owner's Manual page 196

First, however, two components must be removed from the main board:
Remove LB1. Since you are going to discard it anyway, put the tip of the heated
soldering iron with a bit of solder on both terminals of component LB1 and heat it
up. After a while, the solder below LB1 shall melt, so LB1 can be moved easily. It
may even stick to the tip of the soldering iron and may be lifted this way.
Remove LB2 the same way.
Connect the terminals as listed, i.e. number







For each connection, cut a piece of wire (some 150
some solder on it, put some solder on the respective terminals on either board,
and solder one end to the terminal on the USB board. Then determine the
necessary length for an easy connection, cut the wire to proper length, skin its
last 2
board. Finally, check the proper connection using an Ohmmeter (test voltage =
some 1.5
h. Optional: Install the additional components for an accurate real-time clock.
Tools needed:
Material needed:
Procedure:
Check top right of the main board. If the
quartz crystal Y1 and the two capacitors
C3 and C4 next to it are not installed yet,
you can do that now. It is not mandatory,
but will help in communication (cf. p.
166). It is inevitably required, however,
for using the full set of print, time, and
date commands including the stopwatch.
See the picture here for comparison and
the file mentioned at point 1
parts specifications and work instructions.
Soldering these capacitors is a challenge for the common man since they are really
(really!) small. Alternatively, you may use wired capacitors: the result does not look
half as professional but it is far easier achieved and does the job as well.
Remember to activate the crystal when the tuning is completed (see p. 185).
82
JP5 and JP6 are jumpers, i.e. 0
83
Since the electronic components are small and densely packed on these boards, there is a fair chance of
producing solder bridges – thoroughly check and remove where you produced them. Also take care that
you do not heat any mounted component to an extent where it will start moving away. Soldering on the
main board requires a slow hand, good eyesight, and a bit of experience.
WP 34S Owner's Manual
3 (IR printing) to upper terminal of R18,
4 (Bat+) to the big upper battery terminal,
5 (Vcc) to the right terminal of LB1,
6 (GND) to the top end of C21,
7 (RxD) to either end of JP5,
8 (TxD) to either end of JP6,
and connect both big upper battery terminals.
mm
, and put some solder on it. Solder this end to the terminal on the main
83
V ).
Soldering iron as for step f, wooden toothpick for holding components.
pF
Two 18 0603 capacitors, one 32.768
Ω
resistors.
82
above for
Edition 3.1
mm
). Skin its first 2
kHz
quartz crystal, solder.
Page 196 of 211
mm
, put